Siemens-martin furnace



June 16, 1925.

June 16, 1925.

Filed Aug. 29, 1921 3 Sheets-Sheet 2 June 16, 1925. 1,541,843

' P OSTENDORF SIEMENS-MARTIN FURNACE Filed Aug- 1921.

3 Sheets-Sheet 3 Fatented June 16, 1925.

PETER OSTENDOEF, OF VIENNA, AUSTRIA.

SIEMENSJVIARTIN FURNACE.

Application filed August 29, 1921. Serial No. 496,688.

(GRANTED UNDER THE PROVISIONS OFTHE A91 OF MARCH 3, 1921, 41 STAT, In, 1313.)

To all whom it may concern:

Be it known that 1, PETER Os'rnnnonr, a citizen of the German Empire, and resident of Vienna, Austria, have invented a certain new and useful Improved Siemens-Martin Furnace (for which I filed applications in Germany, Apr. 19, 1918,]?atent No. 313,7 81; Austria, May 21', 1 918,Patent No. 89,151; Hungary, May 2 1, 1918, Patent No. 76,694

France, May 20, 1920, PatentNo. 515,746;

Poland, Sept. 15, 1919,; Czechoslovakia, June 19, 1919, Patent No. 5,061; Yugoslavia, Aug. 17 1921), of which the following is a specification.

This invention relates to Siemens'Martin furnaces, or open-hearth furnaces, of the kind in which the furnaceis combined with gas-producers built integral, or united, with its frontal ends or heads. Concerning these 20 furnaces, it has already been proposed to connect the white-heat zone, of the gas-producers, that is to say: that zone in which the coal is completely burned or gasified with the hearth space so that the radiant heat of this zone acts directly upon said. hearth space and increases its temperature. The white-heat or gasification zone of the gas-producers has been connected, for the purpose in question, by special slots with the hearth space of the Siemens-Martin furnace, but this meansentails considerable disadvantages for the prac tical service because then each furnace head has three channels located above, or below, each other, viz, the air channel, the gas channel, and the connecting channel between the said white-heat zone and the hearth space. Building a furnace head having three channels above one another offers great difliculties and, moreover, such a head is far more exposed to .the danger of burning away than is the case with the usual furnace head having but the simple gas and air-channels Now according to the present invention, the said connecting channel between the white-heat zone of the gas producer and the hearth space of the Siemens-Martin furnace is made to serve not only for the direct transference of the heat of said white heat zone to and into the furnace hearth, as is the case in the known constructions of the furnaces of the kind in qustion, but also forleading the heating gases into the said hearth space. Thus, also in this case the direct utilization and exhaustion. of the gasification heat for the purpose of increasing the furnace hearth temperature is rendered possible, but without a special gas channel between the gas producer and the furnacehearth, special channel being now dispensed with. This simplification offers the further advantage that the temperature of the gas mixed in the gas channel with the products of combustion of the gas producer and being exposed to the high temperature of the gasification or white-heat zone is considerably increased.

The air being highly pre-heated in heat accumulators is preferably introduced in a well known manner into the hearth from above in oblique direction and "under a rather high pressure in order to hold the hot gas down upon the bath and to permeate the compact gas current whereby at the same time the gas and the air are thoroughly mixed and a complete combustion is obtained.

In order to make my invention more clear, I refer to the accompanying drawing, in which similar letters denote similar parts throughout the several views, and in which Figure 1 is a vertical longitudinal section through a furnace constructed according to this invention; Figure 2 is a horizontal section in line AB of Figure 1; and Figure 3 is a vertical transverse section in line GH of Figure 1.

Below the hearth space are disposed the heat accumulators b b in which the air is pro-heated and which are provided with slides or the like (not shown) for controlling the entrance and the discharge of the air. The accumulators b are connected by channels a with channels cZ..provided in the furnace heads and opening from above in oblique direction into the hearth space as. The channels 03 serve for conducting the hot air into said space a and upon the bath.

In front of each furnace head is a gas producer e of any, suitable construction. The gas therein produced is conducted by that.

exterior horizontal pipes f f into gas collecting chambers g 9 provided in the furnace walls. These chambers are connected with a gas conduit 70 extending horizontally in transverse direction through the furnace masonry and communicating with the hearth a by means of passages Z Z. The connection between the chambers g g and the enter ends of said channels 7a 7a is effected by elbows containing each a valveit for controlling or regulating the quantity of gas admitted to the hearth. The passages Z Z open into the hearth at point as possible in order to efiect a very intimate contact of the gas with the bath.

According to the present invention. the heating gas and the flame projecting forth from the white heat gasification zone m of the gas producers mix in the passages Z Z whereby the gas-is highly heated. Owing to the width of the passages Z Z also the radiant heat of the gasification zone of the gasproducer contributes in heating notonly the gas passing through the passages Z Z, but also, although in a lesser degree, the hearth a, whereby an extraordinarily hot working of the furnace is obtained.

In order to conduct the gas coming; from the twolgasproducers into the furnace always at one side only, the chambers g g of the one furnace head are connected with the chambers g. g of the other furnace head by top pipes n n sothat if, f or inst-ance,.the valves it 72, ofthe righthand furnace head are closed, the gas may be led to the lefthand furnace head, andviceversa, the one as deep ahead receiving then the gas from both gas producers. The righthand passage Z,' need not be shut if the gas enters the space (Z through the lefthand passage, or vice versa, the less-soas the white-heat existing in the respective gas-producer shall act upon the bath, as already explained.

The reversal of. the valves it is effected simultaneously with the reversal of the air valves (not shown)=.

I claim An open hearth furnace comprising in combinatioma melting room, agas generator adjacent said melting room, the wall between said melting room and said generator having only tWO SUPQIPOS-Bd channels extending therethrough, one of said channels connecting thelower part of said generator with the lower part of said" melting room, while the other channel extends obliquely downwards intothe upper part of the melting room.

In' testimony whereof I have affixed my signature.

PETER OSTENDORF. In the presence of- B. 'lloLKnNnoRF, O. HARBEL. 

